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US7255728B2 - Apparatus and method for degassing liquids - Google Patents

Apparatus and method for degassing liquids Download PDF

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Publication number
US7255728B2
US7255728B2 US10/502,700 US50270004A US7255728B2 US 7255728 B2 US7255728 B2 US 7255728B2 US 50270004 A US50270004 A US 50270004A US 7255728 B2 US7255728 B2 US 7255728B2
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Prior art keywords
column
liquid
fluid
degassed
inlet means
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Expired - Fee Related, expires
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US10/502,700
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English (en)
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US20050223896A1 (en
Inventor
Jonathan Heath Veal
Martin David Powell
Simon Broughton
Gareth Ian Naylor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ciba Specialty Chemicals Water Treatments Ltd
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Ciba Specialty Chemicals Water Treatments Ltd
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Assigned to CIBA SPECIALTY CHEMICALS WATER TREATMENT LIMITED reassignment CIBA SPECIALTY CHEMICALS WATER TREATMENT LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BROUGHTON, SIMON, NAYLOR, GARETH IAN, POWELL, MARTIN DAVID, VEAL, JONATHAN HEATH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0005—Degasification of liquids with one or more auxiliary substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0042—Degasification of liquids modifying the liquid flow
    • B01D19/0052—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
    • B01D19/0057—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused the centrifugal movement being caused by a vortex, e.g. using a cyclone, or by a tangential inlet

Definitions

  • the present invention relates to an apparatus and method for the removal of gases from liquids and more particularly the removal, in polymerisation systems, of undesirable dissolved and/or entrained gases from liquids to a desired level.
  • the equipment proposed for such deoxygenation comprises a column into which the monomer to be deoxygenated together with the sweep gas is introduced towards the middle or upper part of the column.
  • the intention is that the oxygen will be disengaged from the monomer and rise with the sweep gas to be vented at the top of the column while the deoxygenated liquid monomer accumulates at the bottom of the column from where it can be withdrawn through an outlet.
  • One of the problems that has been identified with this system is that the gases rising in the column entrain small amounts of deoxygenated monomer which are deposited in the column above the site where the monomer and sweep gas are introduced. These deposits then dry out and, falling to the bottom of the column, can initiate polymerization of the somewhat unstable deoxygenated monomer thus blocking the monomer outlet.
  • the present invention seeks to address this problem.
  • an apparatus for degassing liquids comprising a column, inlet means for admitting liquid to be degassed together with sweep gas tangentially into the column, the sweep gas having been mixed with the liquid prior to admission to the column, a tubular baffle within the column adjacent the inlet means for directing fluid from the inlet means down the column whereby gas disengages from the liquid and rises through the baffle to the top of the column and degassed liquid accumulates at the bottom of the column.
  • the invention has particular application to the removal of dissolved oxygen from monomers prior to polymerisation thereof in a continuous polymerisation process.
  • the tangential admission of liquid to be degassed with the intimately mixed sweep gas into the column imposes a rotational movement on the incoming fluid.
  • the fluid stream is directed downwardly by the baffle and forms a film on the inner surface of the column which film continues to move down the column.
  • the baffle itself prevents any gas that is disengaging from the liquid from rising up the column until the fluid has passed below the baffle at which point gas can rise through the baffle towards the top of the column. As a consequence by the time the gas can rise up the column it is free, or substantially free, of liquid.
  • the column at least below the inlet means, is of progressively enlarging cross section.
  • the inlet means may comprise a plurality of inlets spaced around the column preferably at the same level.
  • the invention is particularly intended to be used as part of a continuous process, even though the amount of any liquid carried up the column by the rising gases and deposited on the upper part of the column will be extremely small nevertheless it can happen that over a long period of time these very small deposits could accumulate and cause the very problems that the invention seeks to solve.
  • means may be provided for the admission of a liquid, usually water, into the column at a level above the inlet for flushing away any liquid that may, by chance, have been carried up the column by the rising gases and deposited on the upper part of the column.
  • the invention also provides a method for degassing liquids comprising the steps of admitting liquid to be degassed together with sweep gas tangentially into a column, directing the incoming fluid down the column to form a film on the inner surface of the column whereby gas disengages from the liquid and rises up the column and degassed liquid accumulates at the bottom of the column.
  • FIG. 1 is a diagrammatic side elevation of a degassing column
  • FIG. 2 is a transverse section through a part of the column and on an enlarged scale
  • FIG. 3 is a section on the line A-A in FIG. 2 .
  • the degassing apparatus comprises a column 10 of generally circular cross section and made of material inert to the liquids and gases to be admitted therein.
  • a column 10 of generally circular cross section and made of material inert to the liquids and gases to be admitted therein.
  • the inlet section 12 Towards the top of the column an inlet section 12 is provided.
  • the inlet section 12 consists of a number inlets 14 (two in the illustrated embodiment) arranged to direct incoming fluid, i.e. liquid and gas, into the column tangentially with respect to a tubular baffle 16 mounted in the column and coaxial therewith.
  • the baffle 16 is an open ended tube that defines with the inner wall of the column an annular passageway 18 that is closed at the top 20 and which has a restricted opening 22 at the bottom.
  • the column is progressively increasing cross section towards the bottom thereof. In the illustrated embodiment this is achieved by a number of frusto-conical sections 24 interspersed by sections 25 of uniform cross section. This arrangement is not essential however, and the column below the inlet section 12 could be of continuously enlarging cross section. Above the inlet section 12 at 26 the column is preferably of uniform cross section as shown in FIG. 1 .
  • the apparatus operates as follows. Liquid to be degassed, such as an aqueous monomer intended for polymerisation and a sweep gas are thoroughly mixed for example in an in-line static mixer.
  • the sweep gas can be any inert gas such as nitrogen.
  • the monomer/sweep gas mixture is admitted into the column through the inlets 14 .
  • the incoming fluid swirls around the baffle 16 in the annulus 18 and down to the opening 22 . During this time any gas that disengages from the liquid cannot rise up the column until it has passed through the opening 22 .
  • the fluid After passing through the opening 22 the fluid appears as a film on the inner surface 28 of the column 10 .
  • the film is substantially even and covers the inner surface of the column.
  • the flow rate of the incoming fluid may need to be adjusted in order to achieve this.
  • gas is decoupled or disengaged from the liquid so that by the time the liquid has reached the bottom of the column it is effectively degassed.
  • the disengagement of the gas from the liquid is enhanced by the increasing cross section of the column which cause the film to gradually spread out over the larger area with a consequent gradual reduction in film thickness.
  • Disengaged, substantially liquid free gas rises in the column, passing through the center 30 of the baffle 16 , and is vented through the top of the column 26 .
  • a cationic monomer containing 12 ppm (12 mg/l) of oxygen was introduced into the column described above at a rate of 30 l/hour. Before admission to the column the monomer was mixed with nitrogen sweep gas at a pressure of 50 psi and a flow rate of 1 l/minute.
  • the oxygen level of monomer withdrawn from the bottom of the column was measured and found to be 250 ppb (parts per billion).
  • the monomer was subsequently polymerised in a tube reactor.
  • the invention is not restricted to the above described specific embodiment or Example and many modifications can be made. Thus in some cases perfectly satisfactory degassing can be obtained with a column that is of substantially uniform cross section.
  • the number of inlets 14 is not limited to two but can be increased to any number as desired or reduced to one.
  • the upper part of the column 10 may be equipped with means for flushing away with water any deposits of liquid that may have been carried up the column by the rising gases.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Degasification And Air Bubble Elimination (AREA)
US10/502,700 2002-02-08 2003-01-23 Apparatus and method for degassing liquids Expired - Fee Related US7255728B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB0202990.8A GB0202990D0 (en) 2002-02-08 2002-02-08 Apparatus and method for degassing liquids
GB0202990.8 2002-02-08
PCT/EP2003/000654 WO2003066190A1 (fr) 2002-02-08 2003-01-23 Procede et dispositif de degazage de liquides

Publications (2)

Publication Number Publication Date
US20050223896A1 US20050223896A1 (en) 2005-10-13
US7255728B2 true US7255728B2 (en) 2007-08-14

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US10/502,700 Expired - Fee Related US7255728B2 (en) 2002-02-08 2003-01-23 Apparatus and method for degassing liquids

Country Status (9)

Country Link
US (1) US7255728B2 (fr)
EP (1) EP1474217B1 (fr)
CN (1) CN1306983C (fr)
AT (1) ATE501771T1 (fr)
AU (1) AU2003218963A1 (fr)
BR (1) BR0307480B1 (fr)
DE (1) DE60336382D1 (fr)
GB (1) GB0202990D0 (fr)
WO (1) WO2003066190A1 (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103977602B (zh) * 2013-02-07 2015-11-25 李进民 气液分离装置和具有该气液分离装置的污水处理装置
KR101863464B1 (ko) 2013-07-31 2018-05-31 바스프 에스이 역상 중합 방법
MX2016001418A (es) 2013-07-31 2016-08-18 Basf Se Proceso de polimerizacion de fase inversa.
JP2016525621A (ja) 2013-07-31 2016-08-25 ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ 逆相重合法
ES2662194T3 (es) 2013-12-13 2018-04-05 Basf Se Procedimiento para la extracción de petróleo
EP2933271B1 (fr) 2014-04-15 2016-03-23 Basf Se Procédé de fabrication de homo- ou copolymères solubles dans l'eau comprenant du (méth)acrylamide
AR113377A1 (es) 2017-10-25 2020-04-22 Basf Se Proceso para producir soluciones acuosas de poliacrilamida
AR113375A1 (es) 2017-10-25 2020-04-22 Basf Se Proceso para producir soluciones acuosas de poliacrilamida
WO2019081004A1 (fr) 2017-10-25 2019-05-02 Basf Se Procédé de production de solutions aqueuses de polyacrylamide
EA202091021A1 (ru) 2017-10-25 2020-09-14 Басф Се Способ получения водных растворов полиакриламида
WO2019081003A1 (fr) 2017-10-25 2019-05-02 Basf Se Procédé de production de solutions aqueuses de polyacrylamide
WO2019081321A1 (fr) 2017-10-25 2019-05-02 Basf Se Procédé de production de solutions aqueuses de polyacrylamide
EA202091019A1 (ru) 2017-10-25 2020-09-09 Басф Се Способ получения водных растворов полиакриламида
WO2019233948A1 (fr) 2018-06-06 2019-12-12 Basf Se Copolymères associatifs avec des dérivés d'acide (méth)acrylique et de (méth)acrylamide quaternisés hydrophobes
EP3802725A1 (fr) 2018-06-06 2021-04-14 Basf Se Copolymères associatifs avec des dérivés de (méth)acrylamide et d'acide (méth)acrylique quaternarisés hydrophobes
WO2020079124A1 (fr) 2018-10-18 2020-04-23 Basf Se Procédé de production de compositions de polyacrylamide aqueuses
CA3113155A1 (fr) 2018-10-18 2020-04-23 Basf Se Procede de production d'un concentrat de polyacrylamide aqueux
AR116738A1 (es) 2018-10-18 2021-06-09 Basf Se Proceso de fracturamiento de formaciones subterráneas
WO2020079119A1 (fr) 2018-10-18 2020-04-23 Basf Se Procédé de fourniture de concentrés de polyacrylamide aqueux

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE286749C (fr)
US1782783A (en) * 1924-09-22 1930-11-25 Trumble Gas Trap Company Crude-oil and natural-gas separator
US4007022A (en) 1974-08-29 1977-02-08 Chemische Werke Huls Aktiengesellschaft Process for the removal of gaseous monomers from polyvinyl chloride-water dispersions
US4294676A (en) 1978-07-24 1981-10-13 Rhone-Poulenc Industries Aqueous monomer solutions adapted for direct photopolymerization
US4752306A (en) * 1986-02-13 1988-06-21 Norsk Hydro A.S. Method and apparatus for treating liquid/gas mixtures
US5256171A (en) * 1992-09-08 1993-10-26 Atlantic Richfield Company Slug flow mitigtion for production well fluid gathering system
US5766321A (en) * 1993-04-14 1998-06-16 Nippon Sanso Corporation Apparatus for reducing dissolved oxygen
US6193893B1 (en) * 1998-03-20 2001-02-27 Gdt Corporation Stripping of contaminants from water
DE10016894A1 (de) 2000-04-05 2001-10-18 Bayer Ag Verfahren und Vorrichtung zur Entfernung flüchtiger Bestandteile aus Polymermassen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2415821Y (zh) * 2000-02-25 2001-01-24 天津市上通新技术工程有限公司 液体用涡流脱气器

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE286749C (fr)
US1782783A (en) * 1924-09-22 1930-11-25 Trumble Gas Trap Company Crude-oil and natural-gas separator
US4007022A (en) 1974-08-29 1977-02-08 Chemische Werke Huls Aktiengesellschaft Process for the removal of gaseous monomers from polyvinyl chloride-water dispersions
US4294676A (en) 1978-07-24 1981-10-13 Rhone-Poulenc Industries Aqueous monomer solutions adapted for direct photopolymerization
US4752306A (en) * 1986-02-13 1988-06-21 Norsk Hydro A.S. Method and apparatus for treating liquid/gas mixtures
US5256171A (en) * 1992-09-08 1993-10-26 Atlantic Richfield Company Slug flow mitigtion for production well fluid gathering system
US5766321A (en) * 1993-04-14 1998-06-16 Nippon Sanso Corporation Apparatus for reducing dissolved oxygen
US6193893B1 (en) * 1998-03-20 2001-02-27 Gdt Corporation Stripping of contaminants from water
DE10016894A1 (de) 2000-04-05 2001-10-18 Bayer Ag Verfahren und Vorrichtung zur Entfernung flüchtiger Bestandteile aus Polymermassen
US20030176636A1 (en) * 2000-04-05 2003-09-18 Ulrich Liesenfelder Method and device for removing volatile components from polymer materials

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Derwent Abstract No. 1991-193859 [27] for DD 286749 (1991).
Derwent Abstract No. 2002-083791 [12] for DE 10016894 (2001).

Also Published As

Publication number Publication date
BR0307480B1 (pt) 2011-05-31
CN1630547A (zh) 2005-06-22
BR0307480A (pt) 2004-12-07
ATE501771T1 (de) 2011-04-15
GB0202990D0 (en) 2002-03-27
EP1474217B1 (fr) 2011-03-16
AU2003218963A1 (en) 2003-09-02
EP1474217A1 (fr) 2004-11-10
CN1306983C (zh) 2007-03-28
WO2003066190A1 (fr) 2003-08-14
US20050223896A1 (en) 2005-10-13
DE60336382D1 (de) 2011-04-28

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